// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_WIN_H_
#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_WIN_H_

#include "base/macros.h"
#include "ui/aura/window_tree_host.h"
#include "ui/views/views_export.h"
#include "ui/views/widget/desktop_aura/desktop_window_tree_host.h"
#include "ui/views/win/hwnd_message_handler_delegate.h"
#include "ui/wm/public/animation_host.h"

namespace aura {
namespace client {
    class DragDropClient;
    class FocusClient;
    class ScopedTooltipDisabler;
}
}

namespace views {
class DesktopCursorClient;
class DesktopDragDropClientWin;
class HWNDMessageHandler;

namespace corewm {
    class TooltipWin;
}

class VIEWS_EXPORT DesktopWindowTreeHostWin
    : public DesktopWindowTreeHost,
      public aura::client::AnimationHost,
      public aura::WindowTreeHost,
      public HWNDMessageHandlerDelegate {
public:
    DesktopWindowTreeHostWin(
        internal::NativeWidgetDelegate* native_widget_delegate,
        DesktopNativeWidgetAura* desktop_native_widget_aura);
    ~DesktopWindowTreeHostWin() override;

    // A way of converting an HWND into a content window.
    static aura::Window* GetContentWindowForHWND(HWND hwnd);

protected:
    // Overridden from DesktopWindowTreeHost:
    void Init(aura::Window* content_window,
        const Widget::InitParams& params) override;
    void OnNativeWidgetCreated(const Widget::InitParams& params) override;
    scoped_ptr<corewm::Tooltip> CreateTooltip() override;
    scoped_ptr<aura::client::DragDropClient> CreateDragDropClient(
        DesktopNativeCursorManager* cursor_manager) override;
    void Close() override;
    void CloseNow() override;
    aura::WindowTreeHost* AsWindowTreeHost() override;
    void ShowWindowWithState(ui::WindowShowState show_state) override;
    void ShowMaximizedWithBounds(const gfx::Rect& restored_bounds) override;
    bool IsVisible() const override;
    void SetSize(const gfx::Size& size) override;
    void StackAbove(aura::Window* window) override;
    void StackAtTop() override;
    void CenterWindow(const gfx::Size& size) override;
    void GetWindowPlacement(gfx::Rect* bounds,
        ui::WindowShowState* show_state) const override;
    gfx::Rect GetWindowBoundsInScreen() const override;
    gfx::Rect GetClientAreaBoundsInScreen() const override;
    gfx::Rect GetRestoredBounds() const override;
    gfx::Rect GetWorkAreaBoundsInScreen() const override;
    void SetShape(SkRegion* native_region) override;
    void Activate() override;
    void Deactivate() override;
    bool IsActive() const override;
    void Maximize() override;
    void Minimize() override;
    void Restore() override;
    bool IsMaximized() const override;
    bool IsMinimized() const override;
    bool HasCapture() const override;
    void SetAlwaysOnTop(bool always_on_top) override;
    bool IsAlwaysOnTop() const override;
    void SetVisibleOnAllWorkspaces(bool always_visible) override;
    bool SetWindowTitle(const base::string16& title) override;
    void ClearNativeFocus() override;
    Widget::MoveLoopResult RunMoveLoop(
        const gfx::Vector2d& drag_offset,
        Widget::MoveLoopSource source,
        Widget::MoveLoopEscapeBehavior escape_behavior) override;
    void EndMoveLoop() override;
    void SetVisibilityChangedAnimationsEnabled(bool value) override;
    bool ShouldUseNativeFrame() const override;
    bool ShouldWindowContentsBeTransparent() const override;
    void FrameTypeChanged() override;
    void SetFullscreen(bool fullscreen) override;
    bool IsFullscreen() const override;
    void SetOpacity(unsigned char opacity) override;
    void SetWindowIcons(const gfx::ImageSkia& window_icon,
        const gfx::ImageSkia& app_icon) override;
    void InitModalType(ui::ModalType modal_type) override;
    void FlashFrame(bool flash_frame) override;
    void OnRootViewLayout() override;
    void OnNativeWidgetFocus() override;
    void OnNativeWidgetBlur() override;
    bool IsAnimatingClosed() const override;
    bool IsTranslucentWindowOpacitySupported() const override;
    void SizeConstraintsChanged() override;

    // Overridden from aura::WindowTreeHost:
    ui::EventSource* GetEventSource() override;
    gfx::AcceleratedWidget GetAcceleratedWidget() override;
    void ShowImpl() override;
    void HideImpl() override;
    gfx::Rect GetBounds() const override;
    void SetBounds(const gfx::Rect& bounds) override;
    gfx::Point GetLocationOnNativeScreen() const override;
    void SetCapture() override;
    void ReleaseCapture() override;
    void SetCursorNative(gfx::NativeCursor cursor) override;
    void OnCursorVisibilityChangedNative(bool show) override;
    void MoveCursorToNative(const gfx::Point& location) override;

    // Overridden from aura::client::AnimationHost
    void SetHostTransitionOffsets(
        const gfx::Vector2d& top_left_delta,
        const gfx::Vector2d& bottom_right_delta) override;
    void OnWindowHidingAnimationCompleted() override;

    // Overridden from HWNDMessageHandlerDelegate:
    bool IsWidgetWindow() const override;
    bool IsUsingCustomFrame() const override;
    void SchedulePaint() override;
    void EnableInactiveRendering() override;
    bool IsInactiveRenderingDisabled() override;
    bool CanResize() const override;
    bool CanMaximize() const override;
    bool CanMinimize() const override;
    bool CanActivate() const override;
    bool WantsMouseEventsWhenInactive() const override;
    bool WidgetSizeIsClientSize() const override;
    bool IsModal() const override;
    int GetInitialShowState() const override;
    bool WillProcessWorkAreaChange() const override;
    int GetNonClientComponent(const gfx::Point& point) const override;
    void GetWindowMask(const gfx::Size& size, gfx::Path* path) override;
    bool GetClientAreaInsets(gfx::Insets* insets) const override;
    void GetMinMaxSize(gfx::Size* min_size, gfx::Size* max_size) const override;
    gfx::Size GetRootViewSize() const override;
    void ResetWindowControls() override;
    gfx::NativeViewAccessible GetNativeViewAccessible() override;
    bool ShouldHandleSystemCommands() const override;
    void HandleAppDeactivated() override;
    void HandleActivationChanged(bool active) override;
    bool HandleAppCommand(short command) override;
    void HandleCancelMode() override;
    void HandleCaptureLost() override;
    void HandleClose() override;
    bool HandleCommand(int command) override;
    void HandleAccelerator(const ui::Accelerator& accelerator) override;
    void HandleCreate() override;
    void HandleDestroying() override;
    void HandleDestroyed() override;
    bool HandleInitialFocus(ui::WindowShowState show_state) override;
    void HandleDisplayChange() override;
    void HandleBeginWMSizeMove() override;
    void HandleEndWMSizeMove() override;
    void HandleMove() override;
    void HandleWorkAreaChanged() override;
    void HandleVisibilityChanging(bool visible) override;
    void HandleVisibilityChanged(bool visible) override;
    void HandleClientSizeChanged(const gfx::Size& new_size) override;
    void HandleFrameChanged() override;
    void HandleNativeFocus(HWND last_focused_window) override;
    void HandleNativeBlur(HWND focused_window) override;
    bool HandleMouseEvent(const ui::MouseEvent& event) override;
    void HandleKeyEvent(ui::KeyEvent* event) override;
    void HandleTouchEvent(const ui::TouchEvent& event) override;
    bool HandleIMEMessage(UINT message,
        WPARAM w_param,
        LPARAM l_param,
        LRESULT* result) override;
    void HandleInputLanguageChange(DWORD character_set,
        HKL input_language_id) override;
    void HandlePaintAccelerated(const gfx::Rect& invalid_rect) override;
    bool HandleTooltipNotify(int w_param,
        NMHDR* l_param,
        LRESULT* l_result) override;
    void HandleMenuLoop(bool in_menu_loop) override;
    bool PreHandleMSG(UINT message,
        WPARAM w_param,
        LPARAM l_param,
        LRESULT* result) override;
    void PostHandleMSG(UINT message, WPARAM w_param, LPARAM l_param) override;
    bool HandleScrollEvent(const ui::ScrollEvent& event) override;
    void HandleWindowSizeChanging() override;
    void HandleWindowSizeChanged() override;

    Widget* GetWidget();
    const Widget* GetWidget() const;
    HWND GetHWND() const;

private:
    void SetWindowTransparency();

    // Returns true if a modal window is active in the current root window chain.
    bool IsModalWindowActive() const;

    scoped_ptr<HWNDMessageHandler> message_handler_;
    scoped_ptr<aura::client::FocusClient> focus_client_;

    // TODO(beng): Consider providing an interface to DesktopNativeWidgetAura
    //             instead of providing this route back to Widget.
    internal::NativeWidgetDelegate* native_widget_delegate_;

    DesktopNativeWidgetAura* desktop_native_widget_aura_;

    aura::Window* content_window_;

    // Owned by DesktopNativeWidgetAura.
    DesktopDragDropClientWin* drag_drop_client_;

    // When certain windows are being shown, we augment the window size
    // temporarily for animation. The following two members contain the top left
    // and bottom right offsets which are used to enlarge the window.
    gfx::Vector2d window_expansion_top_left_delta_;
    gfx::Vector2d window_expansion_bottom_right_delta_;

    // Windows are enlarged to be at least 64x64 pixels, so keep track of the
    // extra added here.
    gfx::Vector2d window_enlargement_;

    // Whether the window close should be converted to a hide, and then actually
    // closed on the completion of the hide animation. This is cached because
    // the property is set on the contained window which has a shorter lifetime.
    bool should_animate_window_close_;

    // When Close()d and animations are being applied to this window, the close
    // of the window needs to be deferred to when the close animation is
    // completed. This variable indicates that a Close was converted to a Hide,
    // so that when the Hide is completed the host window should be closed.
    bool pending_close_;

    // True if the widget is going to have a non_client_view. We cache this value
    // rather than asking the Widget for the non_client_view so that we know at
    // Init time, before the Widget has created the NonClientView.
    bool has_non_client_view_;

    // Owned by TooltipController, but we need to forward events to it so we keep
    // a reference.
    corewm::TooltipWin* tooltip_;

    // Visibility of the cursor. On Windows we can have multiple root windows and
    // the implementation of ::ShowCursor() is based on a counter, so making this
    // member static ensures that ::ShowCursor() is always called exactly once
    // whenever the cursor visibility state changes.
    static bool is_cursor_visible_;

    scoped_ptr<aura::client::ScopedTooltipDisabler> tooltip_disabler_;

    // Indicates if current window will receive mouse events when should not
    // become activated.
    bool wants_mouse_events_when_inactive_ = false;

    DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostWin);
};

} // namespace views

#endif // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_WIN_H_
